Improvement in sewing-machines



P. LANGLOIS. Sewing Machine.

No. 201,797. Patented March 26, 187s..

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Specification forming part of Letters Patent N0. 201,797, dated March 26, 1878; application filed October 23, 1877.

To all whom tmay concern:

Be it known that I, PETER LANG-Lors, of Port Henry, in the county of Essex and State of New York, have invented a new and Improved Sewing-Machine; and Ido hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure 1 is a partial plan view of the feed portion of the work-plate, with the needle and presser-foot in horizontal section, and the sliding plate which covers the feeding devices removed. i Fig. 2 is an underneath view or inverted plan, with the cam-bosses in section. Fig. 3 represents details of the'feed devices.

The object of my invention is to provide an improved set of feeding devices for a sewingmachine, designed to secure a more positive and uniform feed 5 and to this end the invention consists in locating a swiveling feed-step upon a peculiarly-constructed four-motioned feed, and combining it with the same and with operating devices, as hereinafter more fully described.

In the drawing, A represents the base-plate of I the sewing-machine, having beneath the same hangers B B, which form bearings for the longitudinal driving-shaft G. Upon said shaft are arranged two cylindrical bosses, D D', having cam-grooves, one of which camgrooved bosses, D, operates the vertically-oscillating elbow-lever E, which drives the needle-bar, and the other. of which operates the horizontally-oscillating elbow-lever F, which drives the shuttle, all as heretofore used.

In the end of one of the bosses, D, is formed a cam-groove, a, in which plays a cam-roller carried by the extremity of a lever, G, said lever being pivoted to oscillate horizontally below the Work-plate.

Upon the end of the shaft C is also arranged aboss, H, having in its end a cam-groove, b. Thesedevices-theleverGandthecam-grooved boss H--serve to impart motion to the feed devices, which will now be described.

I is a plate, fastened vertically to the main frame A by means of a screw-nut, c, and provided with four lugs, d d d' d. J is a horizontally-reciprocating frame, moving between the lugs d and d', and guided in its movement by its extensions e c. This frame extends out flush with the lugs d d', but is recessed in its center to receive the verticallyreciprocating bar K, which, with said frame J, is held in plate I by a plate, L, screwed lto lugs d d.

The bar K is provided at its top with a lip, f, and in the lip is horizontally pivoted a `swiveling circular feed-step, g, serrated or toothed upon its upper surface, and having a central eye, which extends also through the lip, and forms a movable passage-way or throat for the needle.

In operating these devices so as to impart to the feed-step g a four-motioned (or forward, downward, backward, and upward, movement) the forward-and-backward movement is imparted through lever Gr, one end of which is connected, by a screw or otherwise, with the extension c of the frame J, while the upwardand-downward movement is cected by the cam-groove b in the boss H, which operates upon a projection, i, formed upon the vertically-reciprocating bar, and extending through l anopening in the plate L to the said camgroove.

In following the operation of the devices as thus described, it will be seen that the feed is effected by the four rectilinear movements of the feed-step g, while the swiveling plate secures the easy turning' of the work and a better and more uniform stitch, the arrangement being such that said feed-step with its eye not only alternately advances to and retreats from the range of the needle to secure a positive feed, but is concentric with the needle whe the work is being turned.

It will be seen, also, that the cam-grooves a and b impart, through the connecting devices, positive motion for the downward as well as the upward, and for the backward as well as the forward, movement of the feedstep, which is a feature of great importance with such a feed as is herein described, for the reason that if springs were employed for the alternate movement they would not act quickly enough when the machine is driven at a high rate of speed, and the result would be a failure to secure the nice registration of the eye of the feed-step with the needle, which would inevitably break the latter.

In fastening the feed-step to the lip of the vertically-reciprocating bar, the same may be riveted, as shown, 0r a flat-headed screw with a hole drilled through the same may be used; or, as a further modification, the disk or step may have a perforated screw-threaded shank, and a nut screwed upon the same on the opposite side of the lip.

Having thus described my invention, what I claim as new is* The vertically-reciprocating bar K, carrying a horizontaily-swiveling perforated feed-step, g, and having a projection, i, in combination with the horizontally-reciproeating frame J, the boss H, having cam-groove b, the lever G, and the boss D, having cam-groove a, substantially as and for the purpose described.

PETER. LANGLOIS.

Witnesses S. F. MURDOCK, SIMON DoorER. 

